In Jyuu's dreams.....

No. Unless he wants to simulate some random crap on the GPU.
And I'm pretty sure Jyuu can already afford it. And build it. If he wants to.

And until games can scale up well using more than two GPU's, I think he won't even bother.

Note that that guy just did GPGPU on four graphics cards (with two cores on each). Presumably 4x 9800GX2's? Nothing out of the impossible or new. And there are already cases of hospitals using GPGPU to do tomography.